|Publication number||US20080118009 A1|
|Application number||US 11/601,765|
|Publication date||May 22, 2008|
|Filing date||Nov 20, 2006|
|Priority date||Nov 20, 2006|
|Publication number||11601765, 601765, US 2008/0118009 A1, US 2008/118009 A1, US 20080118009 A1, US 20080118009A1, US 2008118009 A1, US 2008118009A1, US-A1-20080118009, US-A1-2008118009, US2008/0118009A1, US2008/118009A1, US20080118009 A1, US20080118009A1, US2008118009 A1, US2008118009A1|
|Inventors||Yu-Min Chuang, Fu-Min Yeh, Juinn-Horng Deng|
|Original Assignee||Yu-Min Chuang, Fu-Min Yeh, Juinn-Horng Deng|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (5), Classifications (5), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a pseudo-random number demodulation circuit of receiving device of wireless communication system. More particularly, it is directed to pseudo-random number (PN) demodulation circuit of a receiving device for a wireless communication system.
The development of communication systems currently is toward to a century of wireless communication systems. Most conventional wireless communication systems use the demodulation circuit of the receiving device as shown in
Please refer to
In the second symbol data, all pilot subcarriers of the header data are multiplied by P1 and P7, and all data subcarriers are multiplied by P7. When the data transmission rate does not exceed 200M bits per second, all pilot subcarriers of the payload data are multiplied by P7 and P13, and all data subcarriers are multiplied by P13. When the data transmission rate exceeds 200M bits per second, all pilot subcarriers of the payload data are multiplied by P8. In the 4th symbol data, all pilot subcarriers of the header data are multiplied by P2 and P8, and all data subcarriers are multiplied by P8. When the data transmission rate does not exceed 200M bits per second, all pilot subcarriers of the payload data are multiplied by P8 and P14, and all data subcarriers are multiplied by P14. When the data transmission rate exceeds 200M bits per second, all pilot subcarriers of the payload data are multiplied by P10. Therefore, a phase-shift estimate unit of the receiving device can obtain the corresponding phase-shift value of each data subcarrier according to each pilot subcarrier. Further, the receiving device can adjust each data subcarrier to the original input data according each phase-shift value.
No matter in header data or payload data, all pilot subcarriers or data subcarriers are mixed together. When the receiving device demodulates the symbol data, it requires determining the addresses of all pilot subcarriers. In other words, the number of subcarriers for the header data and the payload data of each symbol data is required continuously counting for determining the pilot subcarriers as well as proceeding demodulation. For example, one pilot subcarrier is set for every 10 subcarriers. However, not every transmission data is counted in this way. More complicated determination always increases the complexity of the demodulation circuit, and further decreases the performance of the demodulation circuit.
Therefore, the present invention is to provide a pseudo-random number demodulation circuit of receiving device of wireless communication system as well as to provide a simplifier circuit. More, the present invention does not need to determine the storage address of the pilot subcarrier, and further enhance the performance of the demodulation circuit.
The main object of the present invention is to provide a pseudo-random number demodulation circuit of receiving device of wireless communication system. More particularly, it first demodulates all subcarriers according to a PN. Then, it demodulates all data subcarriers according to a second PN. Therefore, it can individually demodulate all pilot subcarriers and all data subcarriers.
The present invention is directed to a pseudo-random number demodulation circuit of receiving device of wireless communication system. It has a first demodulator, a splitter, and a second demodulator. The first demodulator demodulates all pilot subcarriers and all data subcarriers of the symbol data in the receiving device according to multiple first PN. The splitter splits the pilot subcarriers and the data subcarriers from the demodulated symbol data, and the data subcarriers are transmitted to the second demodulator. The second demodulator demodulates the output data subcarriers of the splitter according to multiple second PN. Therefore, the receiving device of the present invention can enhance the performance of multiple symbol data. Further, the receiving device of the present invention has a FFT unit, a phase-shift estimate unit, and a data detector. The FFT unit can fast transform and input symbol data to the receiving device. The phase-shift estimate unit can produce multiple corresponding phase-shift values according to the pilot subcarriers. The data detector detects the data subcarriers for producing the corresponding data according to the phase-shift value.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
Each of the forgoing examples merely illustrates some applications for the present invention. It is understood that the invention is not limited to such embodiments. Other features and advantages of the present invention will become apparent from the following detailed description of the invention made with reference to the accompanying drawings.
The present invention relates to a pseudo-random number (PN) demodulation circuit of a receiving device for a wireless communication system as well as provides a simplifier demodulation circuit. More, the present invention can fast demodulate multiple symbol data which have been modulated by a transmitting device of a wireless communication system according to multiple PN. Each symbol data includes a header data and a payload data. The header data and the payload data individually include multiple pilot subcarriers and multiple data subcarriers. The demodulation circuit of the present invention, therefore, can be used in different kinds of wireless communication systems. Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wide Band (MB-OFDM UWB) system is one of the examples in the present invention.
Please refer to
The splitter 26 is a demultiplexer. The splitter 26 receives the symbol data demodulated by the first demodulator 24. The splitter 26 is used to split the pilot subcarriers and the data subcarriers from the symbol data. The splitter 26 transmits the pilot subcarriers to the phase-shift estimate unit 30. More, the splitter 26 transmits the data subcarriers to the second demodulator 28. The second demodulator 28 demodulates the data subcarriers modulated by the second PN according to a third PN. The second demodulator 28 is a multiplier, and makes the data subcarriers multiply by the third PN and demodulates for the original data subcarriers. The third PN is corresponding to the second PN. The second demodulator 28 transmits the demodulated data subcarriers to the data decoding unit 32. The data decoding unit 32 can detect the recorded data information of the data subcarriers according to the phase-shift estimate unit 30 as well as multiple estimated phase-shift values from the pilot subcarriers. The first PN, the second PN, and the third PN can be 1 or −1.
Please refer to
As can be seen from
According to the above description, the present invention is to provide a PN demodulation circuit of a receiving device for a wireless communication system. More, the present invention relates a PN demodulation technique mixed with regular pilot subcarriers and data subcarriers. The demodulation technique can simplify the PN demodulation circuit of the receiving device. Further, the demodulation circuit first uses the first demodulator to demodulate all pilot subcarriers and data subcarriers according to all PN of pilot subcarriers and data subcarriers. Then, the PN of the data subcarriers in the receiving device are used to demodulate the data subcarriers of all demodulated subcarriers.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and detailed description. It should be understood, however, that the drawings and detailed description thereto are not intended to limit the invention to the particular form disclosed, but, on the contrary, the invention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present invention as defined by the claims. As may be seen, the described embodiments may be modified in many different ways without departing from the scope or teachings of the invention. Similarly, any combination of the teachings herein may be modified to achieve similar but different results.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7830984 *||Mar 30, 2007||Nov 9, 2010||Hong Kong Applied Science And Technology Research Institute Co., Ltd.||OFDM/OFDMA channel estimation|
|US7881392||Mar 30, 2007||Feb 1, 2011||Hong Kong Applied Science And Technology Research Institute Co., Ltd.||OFDM/OFDMA timing synchronization using non-consecutive pilot subcarrier assignment|
|US7991350 *||Dec 4, 2007||Aug 2, 2011||Samsung Electronics Co., Ltd||Apparatus and method for audio output in portable terminal|
|US8194764 *||Nov 26, 2008||Jun 5, 2012||Fujitsu Limited||Phase tracking circuit and radio receiver using the same|
|US20090238306 *||Nov 26, 2008||Sep 24, 2009||Fujitsu Limited||Phase tracking circuit and radio receiver using the same|
|International Classification||H04L27/06, H03D1/00|
|Nov 27, 2006||AS||Assignment|
Owner name: CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY, AR
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHUANG, YU-MIN;YEH, FU-MIN;DENG, JUINN-HORNG;REEL/FRAME:018569/0054
Effective date: 20061117